我想加入两个表，并希望使用linq得到两个表的列

Question

I want to join two tables and want column of both tables in result using linq

I have something like

var k = (from t in Uow.Transactions.GetAllWithReferences()
         join q in Uow.TransactionDetails.GetAll() on t.TransactionId equals q.TransactionId
         select t)

Instead of just tu wabt columns of both t and q

Answer 1

Use anonymous object to select all columns from both tables:

var k = from t in Uow.Transactions.GetAllWithReferences()
        join q in Uow.TransactionDetails.GetAll() 
             on t.TransactionId equals q.TransactionId
        select new { t.Column1, t.Column2, q.Colum3 };

Or just select both entities in anonymous object:

var k = from t in Uow.Transactions.GetAllWithReferences()
        join q in Uow.TransactionDetails.GetAll() 
             on t.TransactionId equals q.TransactionId
        select new { Transaction = t, Details = q };

Or even better - use eager loading of details. Then code will look like:

var k = Uow.Transactions.GetAllIncluding(t => t.Details);

Answer 2

Using lambda syntax, create anonymous result containing both items:

   var joinResult =  Uow.Transactions.GetAllWithReferences()
          .Join(Uow.TransactionDetails.GetAll(), transaction => transaction,
                   details => details, (transaction, details) => new 
                                          { 
                                             Transaction = transaction,
                                             Details = details
                                          });